Russian tuner, TOPCAR has done something sinister to the already fast-selling Porsche family sedan with their stealthy Porsche Panamera Stingray GTR. The car certainly takes on a far more aggressive look that we feel is more consistent with the rear greenhouse of the Panamera, largely by giving it a beautiful matte black paint job, more cavernous wheel wells and a pumped up hood. Other improvements include reworked doors, bumpers and rocker panels, and a new rear diffuser and spoiler. The Stingray GTR also makes copious use of carbon fiber and kevlar that aid in lightness and rigidity, so the mods don’t add to its already mildly corpulent curb weight. This wicked tuning package would be little more than show if it were not for the horsepower boost of the 4.8 liter V8, taking it from 400 horsepower to 600, with a future package promising an insane 700 horsepower. With this kind of output and performance, you may end up having to buy your child safety seats from Sparco.